Wash and wipe the fish dry. Lay it in a saucepan with half an onion; cut in thin slices, parsley, two cloves, 1 blade of mace, two bay leaves, thyme, salt and pepper, 1 pint of meat stock, a glass of claret or port wine. Simmer gently for 1/2 an hour. Take out the fish, thicken the gravy with a little flour and butter rubbed together. Stir for five minutes. Pour over the fish and serve.
